Stack-valve for drying-kilns.



A. D. LINN.

STOCK VALVE FOR DRYING KILNS. APPLICATION FILED Aue M. 1912.

Patented Au 3,1915.

2 SHEETSSHEET 1.

Q l b Patented Aug. 3, 1915.

2 EEEE T S EEEEE 2 ALLEN n. LINN, or GRAND Barri-3s, iv ron W'ORKS, orGRAND narIDs ror-I oAN, A CORPORATION or MICHIGAN.

STACK-VALVE FOR DRYIN G-KI'LN S.

Application filedAugust 14, 1912.

' kilns for drying lumber and the like; and,

while particularlyapplicable tothe kiln ,described in Letters'aPatent ofthe United States: granted to me under date of October 10, '1911, ,No.1,005,243, it. is likewise. capable of employment toadva-ntage in theop: eration of other like kilns having generally similarcharacteristics. 4 v i Inthe use of drying kilns of the type re-. ferredto, the orderly progress'of the operation is at times liable to be.interfered with by the disturbing effects of high winds. In someinstances, it is foundthat the; wind, dependingupon its 'velocityand thequarter from which it comes, will blow downwardly through the chimneystacks, :a'nd'will introduce into the interioro'fithe kiln a volume ofcold air, thereby chilling the vwoodand causing a depositionof moistureupon its surface, or otherwise interfering with the drying operationatthe zone where thedown draft takes'place. :In other instances, againdepending upon the velocity and course of the. wind, it is-found toexert a rapid exhausting action upon the kiln, with the reserve the;desired normal kiln, under; all conditions of wind and 1 weathe-r, byautomatically preventing the;

disturbing influence of. the wind, whether sult that the operation ispractically brought to a stand-still by: the continuediwithdrawal of'thekilnsheated atmosphere. 1. w The present invention is designed topreoperati'on of the tending to cause-a down draft in the stacks,

. 3 ortending to'withdrawits effectiveatmos+ pherei. To thisend, as willhereinafter 'more fully; appear, I'- have stacks of the kiln with ingvalves, they will provided the several automatically operatcloseappropriately tov prevent either a down .draftor' an excessive updraft,

Specifiationbf Letters Patent.

. represents a like view of one of the kiln, and which set forth,

so constructed and arranged that Serial No. 714,963

as thecase may be, which would otherwise result from the action of thewind.

In the accompanying drawings, Figure 1 represents a longitudinalsectional view of a kiln illustrating the application of 1nyimprovementsthereto; Fig. 2 represents, in section, the automatic valve and its capor casing, and illustrates a series of valvesof different length,interchangeable with each other and adapted for use at various locationsalong the length of the kiln; Fig. 3 of the valves and its cap orcasing, on 'a larger scale;

"TE -STATE Erna rron.

IGAN, assre von, T0 GRAND RAPIDS VENEER Patented Aug. 3, i915.

Fig. a represents a top plan view thereof;

and Fig. 5 represents a perspective view, illustrating a portion of thecover as hinged and in a raised position, for the ready removala'ndreplacing of the automatic valve Similar letters of referencedesignate similar parts throughout the several views.

i As hereinbefore explained, the kiln struc* ture shown in the drawingsis chosen as a suitable kiln structure to which my invention 1 may beapplied, although it will be understood that the invention is notlimited to employment with this particular construction of kiln, which,nevertheless, is one wherein its; aclvantages are prominent in Ipractice.

' In the kiln structure shown, Aindicates the side'walls'of the kiln,and C indicates the end walls, provided respectively with'entrance doora and exit door 6.

0 indicates the ventilating or draft discharge. stacks, projectingthrough the roof B and'provided with horizontal extensions orintakes: 0,which rest upon the floor D may be provided with hinged valves ordampers (Z and with slide 7 dampers e. I

In my patent referred to, the construction and'm'ode' of operation ofthe kiln is fully and the corresponding parts shown in the presentdrawings-are similarly lettered, and cross reference is now made to thespecification of said patent for the further-understanding of the kilnsfunctions.

In myxp'resent invention,-I' apply to the several chimney stacks c theautomatic valve whose particular construction r is illustrated morefully in Figs. 3, 4:, and 5.' The valVe structure consists ofacapwhoselower portion 8, is "adapted to fitthe chimney stack. Thelower portion aoifthe c r is i v d;w

the valves from their casings, and the facility with which they may besubstituted by others of different length, gives the necessaryflexibility to the system, adapting it to Whatever kiln conditions. aredesired along the length of the kiln, the valves be ing proportioned inlength to the Work to be accomplished and to the particular kind ofstock treated, Whether previously air dried, or green from the saW, andWhether hard Wood or soft Wood.

I prefer to make the compression cap and the valve of non-corrodiblematerial, as, for instance, of sheet copper, andto make the rods 25* andt likewiseof non-corrodible material, as, for instance, of brass,so thatthe parts may not only resist atmospheric influences, but also so thatthey may not be ailected by the kiln gases.

What I claim is 1. A stack valve for kilns for drying lumber and thelike, said valve being balanced to normally vent the stack, said valvehaving two seats against one of which it is adapted to close as againstdowndraft from the outer air, and against the other of which it isadapted to closeas against Wind suction; substantially as described.

2. A stack valve for kilns for drying lumber and the like, comprising acompres sion cap or casing having an outlet opening into the outer air,and a balanced valve operating in said casing'and having an upper andlower seat, said valve being removably journaled in the casing so as tobe readily replaceable;

substantially as described.

per and lower seat, said an interior cross 3. A stack valve for kilnsfor drying lumber and the like, comprising a compres sion cap or casinghaving an outlet opening into the outer air, and a balanced valveoperating in said casing and having an upvalve being removably journaledin the casing so as to be readily replaceable, said casing beingprovided With a hinged top section normally holding the valve in place;substantially as described. I

4. A stack valve for kilns for drying lumber and the like, comprising acompression cap or casing having an opening into the outer air, and abalanced valve operating Within the casing, said casin having aninterior cross partition constituting one seat for the valve'and havinga top section constituting another seat for the valve; sub stantially asdescribed.

A stack valve for kilns for drying lumber and the like, comprising acompres sion cap or casing having an opening into the outer air, and abalanced'valve operating Within the casing, said casing having partitionconstitutingone seat for the valve and having a top section constitutinganother seat for the valve, the

top section and partition being elliptical in cross-section;substantially as described. In testimony whereof I afiiX my signature,in presence of two Witnesses.

i ALLEN D. LINN.

Witnesses:

W. H. JUs'rIoE, H. LODGE.

Copies of this patent may be obtainedifor five cents each, by addressingthe Commissioner of Patents Washington, D. C.

